Shear banding instability in wormlike micellar solutions

Britton, Melanie M.; Callaghan, Paul T.

doi:10.1007/s100510050610

Cited by 100 publications

(79 citation statements)

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“…9) the stress smoothly and rapidly approaches its equilibrium value with a relaxation time interval that is shorter than 10 s (corresponding to about 7λ), in the same way as observed in Fig. 8(a) by Britton and Callaghan [5,25] in a cone-plate geometry under steady shear, and also with our previous work on LAOS [45]. However, the time varying velocity profiles reported in this previous studies exhibited a smoother (less sharply banded) shape than the steady shearing profiles presented here.…”

Section: Stress Relaxation and Elastic Instability Onsetsupporting

confidence: 72%

“…They documented three different shear bands arranged normal to the velocity gradient direction, with one high-shear-rate band at the center of the gap and two low-shear-rate bands adjacent to each of the boundaries. Fluctuations of the interface between adjacent shear bands were also reported [25]. In particular, slow migration of the interface (on time scales of many seconds) was observed and attributed to stress relaxation.…”

Section: Introductionmentioning

confidence: 66%

“…Callaghan [5,25] obtained for the same geometry. The PIV measurements showed that in this oscillatory time-varying flow there was a rather smooth variation of the shear rate across the gap.…”

Section: Introductionmentioning

confidence: 94%

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Spatiotemporal dynamics of multiple shear-banding events for viscoelastic micellar fluids in cone-plate shearing flows

Casanellas¹,

Dimitriou²,

Ober³

et al. 2015

Journal of Non-Newtonian Fluid Mechanics

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We characterize the transient response of semi-dilute wormlike micellar solutions under an imposed steady shear flow in a cone-plate geometry. By combining conventional rheometry with 2-D Particle Image Velocimetry (PIV), we can simultaneously couple the temporal stress response with time-resolved velocimetric measurements. By imposing a well defined shear history protocol, consisting of a stepped shear flow sweep, we explore both the linear and nonlinear responses of two surfactant solutions: cetylpiridinium chloride (CPyCl) and sodium salicylate (NaSal) mixtures at concentrations of [66:40] mM and [100:60] mM, respectively. The transient stress signal of the more dilute solution relaxes to its equilibrium value very fast and the corresponding velocity profiles remain linear, even in the strongly shear-thinning regime. The more concentrated solution also exhibits linear velocity profiles at small shear rates. At large enough shear rates, typically larger than the inverse of the relaxation time of the fluid, the flow field reorganizes giving rise to strongly shear-banded velocity profiles. These are composed of an odd number of shear bands with lowshear-rate bands adjacent to both gap boundaries. In the non-linear regime long transients (much longer than the relaxation time of the fluid) are observed in the transient stress response before the fluid reaches a final, fully-developed state. The temporal evolution in the shear stress can be correlated with the spatiotemporal dynamics of the multiple shear-banded structure measured using RheoPIV. In particular our experiments show the onset of elastic instabilities in the flow which are characterized by the presence of multiple shear bands that evolve and rearrange in time resulting in a slow increase in the average torque acting on the rotating fixture.

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Section: Stress Relaxation and Elastic Instability Onsetsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 66%

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Spatiotemporal dynamics of multiple shear-banding events for viscoelastic micellar fluids in cone-plate shearing flows

Casanellas¹,

Dimitriou²,

Ober³

et al. 2015

Journal of Non-Newtonian Fluid Mechanics

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“…A fundamental understanding of material properties as well as the ability to predict changes that occur within the material during processing is extremely important for industrial application. Investigations so far mainly focused on the shear-banding phenomenon [Britton and Callaghan (1997); Britton and Callaghan (1999); Haward and McKinley (2012); Fischer and Challaghan (2001); Salmon et al (2003)], shear-thickening even in dilute solutions [Hu and Matthys (1995); Cappelaere et al (1994); Hartmann and Cressely (1997a); Hartmann and Cressely (1997b); Hartmann and Cressely (1997c); Cressely and Hartmann (1998); Hartmann and Cressely (1998); Wheeler et al (1998); Hu et al (1998); Nowak (2001); Berret and Serero (2001); Azzouzi et al (2005); Vasudevan et al (2008)] and the corresponding shear-induced structure (SIS) [Wheeler et al (1996); Kadoma et al (1997); Ouchi et al (2006a); Ouchi et al (2006b)] using different techniques such as turbidity [Yamamoto and Taniguchi (2012); Schubert et al (2004); Lerouge et al (2008); Herle et al (2005)], flow birefringence [Dehmoune et al (2007); Berret et al (2002); Wunderlich et al (1987); Oda et al (1997); Ouchi et al (2006b)], light scattering [Liu and Pine (1996); Boltenhagen et al (1997)], cryo transmission electron microscopy (cryo-TEM) [Oda et al (1997); Lu et al (1998)], particle image velocimetry …”

Section: Introduction a General Remarksmentioning

confidence: 99%

Elongational deformation of wormlike micellar solutions

Sachsenheimer

Oelschlaeger

Müller

et al. 2014

Journal of Rheology

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We have investigated the uniaxial elongation behavior of six different wormlike micelle systems covering a broad range of surfactant concentrations cs and salt/surfactant ratios R using the capillary breakup elongational rheometry (CaBER). In the fast-breaking limit (high cs and R), filament lifetime tfil is controlled by the equilibrium shear modulus G0 and the breakage time λbr obtained from small oscillatory shear according to tfil/G0∝λbr2/3 and relaxation time ratios λe/λs≈1 are found. When reptation dominates (high cs, low R) λe/λs<1 is observed similar as for solutions of covalently bound polymers. In this concentration regime, the micellar structure seems not to be affected by the strong elongational flow. In contrast, high filament lifetimes up to 1000 s and λe/λs values up to 10 are observed at low cs irrespective of R. This indicates the formation of elongation-induced structures (EISs). A minimum viscosity and a minimum initial diameter are required for creating EIS. Additional filament stretching experiments indicate that a critical total deformation has to be exceeded for structure build-up. Finally, our experiments reveal a distinct difference regarding the dependence between solutions of linear and branched micelles of filament lifetime on viscosity suggesting that CaBER is a versatile means to distinguish between these structures.

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“…In those experiments, shear-banding is attributed to the presence of a stress plateau on the flow curve associated with a structural change, observed for instance using x-ray diffraction techniques [5,6,10] or direct visualizations of birefringence bands in the flow field [20,21]. Recently, a few experiments using Nuclear Magnetic Resonance velocimetry have evidenced the fact that velocity profiles in such systems may display bands of different shear rates [22,23]. However, some of these experiments have reported a contradictory picture for the shear-banding instability: it seems that the observed structural bands do not always correspond to bands of different shear rates, at least in a specific wormlike micellar system [24].…”

Section: Introductionmentioning

confidence: 99%

Shear banding in a lyotropic lamellar phase. I. Time-averaged velocity profiles

2003

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Using velocity profile measurements based on dynamic light scattering and coupled to structural and rheological measurements in a Couette cell, we present evidences for a shear-banding scenario in the shear flow of the onion texture of a lyotropic lamellar phase. Time-averaged measurements clearly show the presence of structural shear-banding in the vicinity of a shear-induced transition, associated to the nucleation and growth of a highly sheared band in the flow. Our experiments also reveal the presence of slip at the walls of the Couette cell. Using a simple mechanical approach, we demonstrate that our data confirms the classical assumption of the shear-banding picture, in which the interface between bands lies at a given stress σ ⋆ . We also outline the presence of large temporal fluctuations of the flow field, which are the subject of the second part of this paper [Salmon et al., submitted to Phys. Rev. E].

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Shear banding instability in wormlike micellar solutions

Cited by 100 publications

References 0 publications

Spatiotemporal dynamics of multiple shear-banding events for viscoelastic micellar fluids in cone-plate shearing flows

Spatiotemporal dynamics of multiple shear-banding events for viscoelastic micellar fluids in cone-plate shearing flows

Elongational deformation of wormlike micellar solutions

Shear banding in a lyotropic lamellar phase. I. Time-averaged velocity profiles

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